javascript - 检查链接是否为图片

Question

我需要检查一个 URL 是否是一个图像。

答案here

/(jpg|gif|png)$/.test(...

当非图像 URL 中有扩展名时，在我的(特殊)情况下会引发误报

http://www.example.com/jpg/bpgpage/

(PS:不能用jquery，只能用javascript/regex)

Answer 1

只要 uri 以扩展名结尾，这应该每次都有效。

代码:

var isUriImage = function(uri) {
    //make sure we remove any nasty GET params 
    uri = uri.split('?')[0];
    //moving on, split the uri into parts that had dots before them
    var parts = uri.split('.');
    //get the last part ( should be the extension )
    var extension = parts[parts.length-1];
    //define some image types to test against
    var imageTypes = ['jpg','jpeg','tiff','png','gif','bmp'];
    //check if the extension matches anything in the list.
    if(imageTypes.indexOf(extension) !== -1) {
        return true;   
    }
}

示例:

• http://jsfiddle.net/fMCFB/1/